Method for hardening a light-sensitive silver halide photographic material

ABSTRACT

A COMPOUND OF THE FORMULA   ((4,6-BIS(2-R-AZIRIDINO)-S-TRIAZIN-2-YL)-N(-R&#39;&#39;))2-R&#34;   WHEREIN R IS HYDROGEN, METHYL OR ETHYL;R&#39;&#39; IS HYDROGEN OR A GROUP CAPABLE OF FORMING A PIPERAZINE RING TOGETHER WITH R&#39;&#39; AND N; AND R&#34; IS AN ALKYLENE RADICAL HAVING LESS THAN 10 CARBON ATOMS OR A SUBSTITUTED OR NONSUBSTITUTED PHENYLENE GOUP IS ADDED TO A LIGHT SENSITIVE GELATINOUS SILVER HALIDE PHOTOGRAPHIC MATERIAL TO HARDEN SAME.

United States PatentO US. Cl. 96-111 5 Claims ABSTRACT OF THE DISCLOSURE A compound of the formula wherein R is hydrogen, methyl or ethyl; R is hydrogen or a group capable of forming a piperazine ring together with R" and N; and R" is an alkylene radical having less than carbon atoms or a substituted or nonsubstituted phenylene group is added to a light sensitive gelatinous silver halide photographic material to harden same.

This invention relates to a method for hardening a lightsensitive silver halide photographic material by using as a hardening agent a new compound of the general formula wherein R is hydrogen, methyl or ethyl; R is hydrogen or a group capable of forming a piperazine ring together with R" and N; and R" is an alkylene radical having less than 10 carbon atoms or substituted or non-substituted phenylene radical.

In the prior art, certain compounds which include such inorganic compounds as chromium alum, chromium trichloride, etc. and such organic compounds as Formalin, glyox-al, acrolein, etc. are known as hardening agents. Among these, however, those which have an aldehyde group are photographically active so that they cause undesired fogging or desensitization of the emulsion concerned. Further, they have a very adverse influence on color formation in a light-sensitive color-photographic material in which a color coupler is incorporated. The chromate type hardening agent and the aldehyde type hardening agent will provide too much hardening effect just after their addition to a gelatinous photographic coating solution so that it sometimes becomes difiicult to obtain smooth coating of said solution.

The compounds of the above-indicated general formula are entirely different in chemical structure from the known hardening agents and are substantially free from the above-mentioned disadvantages.

Typical compounds useful in this invention and synthetlc procedures therefor will be mentioned below.

2-yl) -hexamethylenediamine A three necked flask equipped with a thermometer, dropping funnel and mechanical stirrer is charged with 173 g. of N,N'-bis(4,6-dichloro 1,3,5 triazine-Z-yl) hexamethylenediamine, 900 cc. of dioxane and 400 cc. of water and subjected to external cooling with ice. Then, 109 g. of ethyleneimine and a solution of 174 g. of potassium carbonate in 1000 cc. of water are alternately added dropwise with stirring. During the addition, the inner temperature is controlled so that it does not exceed 5 C. by regulating the rate of the addition. After completion of addition, agitation is continued for further 2.5 hours at the same temperature and cooling is stopped and then agitation at room temperature is carried out for dition of activated charcoal and then concentrated under reduced pressure at a temperature below 40 C. The resulting viscous semi-solid is crystallized by adding acetone. Crude yield: 89 g. Melting point: 124-129 C. The product is dissolved in chloroform and re-precipitated 4 dissolved in a sole or mixed organic solvent which is usually used such as methanol, dimethyl formamide or the like. It is preferably added in an amount of 01-20% based on the dry weight of gelatin, contained in a coating solution. In general, the hardening agent is added after with acetone to give 75 g. of white powdery crystal meltthe second ripening of a silver halide emulsion has been ing at 129l31 C. completed. The hardening agent used in this invention Elementary y for ao ao rz (P may be used together with additives which are commonly C, 54.76; H, 6.90; N, 38.33. Found (percent): C, 54.32; applied to a silver halide emulsion such as a stabilizer, H, 7.37; N, 38.34. coating aid, sensitizing dye, etc. The hardening agent is SYNTHESIS OF THE COMPOUND (3) applicable also to such silver halide emulsion as subjected to the gold-sensitization, sulfur-sensitization and a 9-h chemical sensitization using polyalkylene oxide. Further, zyn'plperazme the hardening agent used in this invention may be mixed A mixture comprising 76 g. of l,4-bis(4,6-dichloro- With a coupler. 1,3,5-triazine 2 yl)piperazine, 300 cc. of dioxane and Addition of the hardening agent brings about effective 300 cc. of water is cooled with ice so that it is kept at hardening without causing any undesirable effects on the 35 C. and dropped alternately with 34 g. of ethylenephotographic properties of emulsions such as fogging, imine and a solution of 114 g. of potassium carbonate in sensitivity, and moreover the photographic emulsion added 300 cc. of water with thoroughly stirring. After the addiwith the hardening agent can show appreciably improved tion, the mixture is stirred for further 2 hours at the same stabilizing effect for fog and photographic speed during temperature and allowed to stand overnight in a refrigthe storage of light-sensitive materials for a long period erator. The reaction mixture is then filtered and the of time. filtrate is extracted with chloroform and concentrated The present invention is further illustrated by way under reduced pressure at a temperature below 40 C. of the following examples but it should be understood The resulting viscous liquid is crystallized by adding that the present invention is not to be limited to these n-hexane. The crystals are collected by filtration and examples but various modifications within the extent of washed with acetone. The crude product is re-dissolved the claims are possible. in a small amount of chloroform and recrystallized from Example l.A silver bromoiodide photographic-negan-hexane acetone to give g. of purified colorless 0 tive emulsion containing 3 mol percent of silver iodide powdery crystal melting at above 300 C. was prepared according to an acid emulsion process. This Elementary analysis.Calcd. for C H N (percent): emulsion was added with the gold sensitizer and immedi- C, 52.92; H, 5.92; N,41.16. Found (percent): C, 52.51; ately thereafter subjected to second ripening. The thus H, 6.00; N, 41.53. treated emulsion was divided into four portions. One SYNTHESIS OF THE COMPOUND (4) portion of the emulsion was applied onto a support to grve a control sample. Each of the remaining three por- -P Py tions was added with the above compounds (1), (3) and 2-Y1)-tfimethylellediamine (4) in the form of a methanol solution, respectively, and The above compound can be obtained by the same 40 P a support to give comparaiive Samplespmcednre f the compound (1) as aforementioned by Determination of the hardness of the resulting films was using bis(4,6-dichloro 1,3,5 triazine-2-yl)trimethyleneaccordmg to the ,fouowlng method: diannne and zmethyl ethylenennine in place of bis(4,6 With respect to films immediately after the preparation, dichloro 1,3,5 triazine-Z-yl)hexamethylenediamine and mcubated for 3 In a thermostat at and ethyleneimine. The product is white crystal melting at cubated for days thermo'hygrostat at and 80% of relative humidity, a temperature at which such Elementary analysis calcd for CzlHsoNm (percent); films dissolve in pure water and a time required for such C 5599; H, 6J1; N 37 30 Found C, 55 59; films t0 begin t0 dlSSOlVB in a 3% SOllltlOll Of sodium H, 7.08; N, 37.66. carbonate monohydrate kept at C. were measured. In the application f the hardening agent f this The results obtained are shown in Table 1. In this test, vention to light-sensitive photographic materials, it may 50 photographlc sensltlvlty Whlch is an inverse number of be added to sub layer, emulsion layer, inter layer, protecthe amount of light exposure to give an Optical density tive layer, backing layer, etc. of light-sensitive silver f above g density is expressed as relative Speed to halide photographic materials. Alternatively, the hardenthat of unstored control film.

TABLE 1 Photosensitiveness Hardness oi emulsion (just after the repara- Time required to begin to dissolve in alkali tion oft e film) Dissolving temperature in pure water 0.) solution (second) Amount Ineubated at incubated incubated at per 100 g. Incubated at 50 C. and at C. 55 C. and of Immediately 55 C.ior3 R.H.t0r3 Immediately ior3 days 80% R.H ior3 gelatin Relative after the prepdays after the days after the after the after the days after the (g.) Fog spee aration preparation preparation preparation preparation preparation Control 0.23 28.2 29.1 30.2 3.1 3.3 3.3 Compound 1.. 0. 45 0.15 92 70 70 70 122 95 Compound 3.. 2.40 0.19 91 66.0 70 70 25 25 23 Compound 4... 1.80 0.18 96 65.0 65.0 70 15 1s 23 ing agent may be used by means of the hardening process comprising immersion after the coating of emulsion, that is to say, the hardening process by bathing before, during or after the development. The hardening agent of this invention can be used together with another hardening agent. Addition of the hardening agent to light-sensitive Example 2.A similar photographic emulsion as used in the Example 1 was subjected to the second ripening and then divided into five portions. One of the portions was used as a control and each of the remaining four portions was added with the compound (1) in an amount indicated below to give comparative samples. With respect photographic materials is made in the form of a solution 75 to films obtained by using the emulsions thus prepared,

photographic properties and hardness were determined by 2. A method for hardening a light-sensitive gelatinous the same method as in the Example 1. The results obtamed are shown in Table 2 silver halide photographic material as claimed in claim TABLE 2 Photosensltiveness Hardness of emulsion (just after the prepara- Time required to begin to dissolve in alkali tion of the film) Dissolving temperature in pure water 0.) solution (second) Amount Incubated at Incu bated Incubated at per 100 g. Incubated at 60C. and 80% at 55 C. 55 C. and of Immediately 55 C. for 3 RH. for 3 Immediately [or 3 80% RH. for 3 gelatin Relative after the prepdays after the days after the after the prepdays after the days after the (g. Fog speed aration preparation preparation aration preparation preparation Control 0.25 100 28. 1 29. 1 30. 1 3 3. 5 3. 6 Compound 1 0. 2 0. 21 98 30. 3 34. 1 35. 3 3. 5 3. 4 3. 5 0.3 0. 21 96 39 40. 2 41. 9 7. 8 10.4 4. 0. 4 0. 19 96 70 70 70 100 102 85 0. 6 0. 14 89 70 70 70 140 133 105 Application of the emulsion added with the compounds 1, wherein said compound is incorporated in any one of used in this invention was satisfactory and, as apparent e g us layers f 83 d photograp ic materla l. from the Tables 1 and 2, excellent hardening eifect was 20 A method for 1121146111113 a 11ght-Sen1t1Ve861201110118 obtained without causing any fogging or desensitization sllver h Photograph: male1"1a1 as 313111160111 2 of the mulsion whereln sa1d photographic material is a 11ght-sens1t1ve Example 3 similar photographic emulsion as used gelatinous silver halide color-photographic material having a coupler incorporated therein.

4. A method for hardening a light-sensitive gelatinous silver halide photographic material as claimed in claim 1, wherein said compound is added in the amount of 0.1- 20% on the dry weight basis of the gelatine contained in said photographic material.

in the Example 1 was subjected to the second ripening and then added with the color coupler. 1-(4-phenoxy-3- sulfophenyl)-3-heptadecyl-5-pyrazolone. The resulting emulsion was divided into four portions. One of the portions was used as a control sample and each of the remaining Portions Was added with the C0II1P0I1I1d 5. The method for hardening gelatin, characterized 1n the form of a methanol Solutlon and pp by adding to the gelatin a compound of the general foronto a support to give comparative samples. mula Determination of the hardness of the resulting films RCH N R R CHR was made in the same manner as Example 1 and photo- I 1 I graphic properties were measured on the films which had g IL I ll been subjected to the treatment with a color developer comprising diethyl-p-phenylenediamine and bleaching, fixing and washing treatments according to a usual manner. N N Results obtained are shown in Table 3. CE/IZQCEFR QQ TAB LE 3 Photosensitiveness Hardness of emulsion (just after the prepara- Time required to begin to dissolve in alkali tion of the film) Dissolving temperature in pure water 0.) solution (second) Amount Ineubated at Incnbated incubated at per 100 g. Incubated at C and 80% at C. 50 C. and of Immediately 50 C. for3 RH. for 3 Immediately for 3 days 80% R. H for gelatin Relative after the prepdays after the days after the after the prepafter the 3 days after the Fog speed aration preparation preparation aration preparation preparation Control 0. 20 100 29. 1 30. 0 30.1 3. 5 3. 7 3. 8 Compound 1.- 0. 5 0. 13 98 70 70 70 122 130 99 Compound 3 1. 0 0. 18 98 33. 3 36. 9 36. 2 16 16 10 Do 2.0 0.16 94 63 70 70 22 21 18 As noted from the Table 3, the photographic emulsions wherein R is hydrogen, methyl or ethyl; R is hydrogen or added with the compounds used in this invention are a group capable of forming a piperazine ring together free from fogging and cause no undesirable effect on 55 with R and N; and R is an alkylene radical having less color photographic coupler. than 10 carbon atoms or substituted or non-substituted What we claim is: phenylene radical.

1. A method for hardening light-sensitive gelatinous References Cited silver halide photographic materials, characterized by UNITED STATES PATENTS adding as a hardening agent a compound of the general formula 2,983,611 5/1961 Allen et al. 96-111 I I 3,017,280 11/1962 Yudelson 260-1l7 3 N f N 2,950,197 8/1960 Allen et a1. 96-1l1 N-f Trev-15f TN I 2,171,427 8/1939 Eggert et al. 260-117 g, L N I 2,712,004 6/1955 Thomas 260 249.6

\/ V 65 2,964,404 12/1960 Burness 260-117 I 3,317,529 5/1967 Beachem et al. 260 249.6

N 3,220,848 11/1965 Himmelmann et al. 96--111 Cz CHR Cfiz CH R WILLIAM D. MARTIN, Primary Examiner wherein R 18 hydrogen, methyl or ethyl; R is hydrogen or a group capable of forming a piperazine ring together SOFOCLEOUS Asslstant Exammer with R" and N; and R" is an alkylene radical having Us cl XR less than 10 carbon atoms or a substituted or non-substituted phenylene group. 96-114]; l06125; 260-117, 249.6 

